This Gallagher 4.0 Joule S400 Solar Electric Fence Charger is a fully portable and built to power up to 60 miles / 280 acres of clean fence and boasts several solar technology improvements like multiple power options, that make it ideal for both livestock inclusion and wildlife exclusion. The S400 will continue to work up to 2 weeks without the sun. The S400 has a 360 degree mounting capability, making it easy to mount onto a post that is already part of the fence line, no matter what direction the post is facing. Easily face your S400 towards the sun. Battery status indicator provides peace of mind by indicating if the battery needs to be charged or replaced.